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networking pygame python raspberry-pi

How to save pygame Surface as an image to memory (and not to disk)

发布于 2013-10-05 01:55:32

I am developing a time-critical app on a Raspberry PI, and I need to send an image over the wire. When my image is captured, I am doing like this:

# pygame.camera.Camera captures images as a Surface
pygame.image.save(mySurface,'temp.jpeg')
_img = open('temp.jpeg','rb')
_out = _img.read()
_img.close()
_socket.sendall(_out)

This is not very efficient. I would like to be able to save the surface as an image in memory and send the bytes directly without having to save it first to disk.

Thanks for any advice.

EDIT: The other side of the wire is a .NET app expecting bytes

Questioner
jhfelectric
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kalhartt 2013-10-05 11:38:26

The simple answer is:

surf = pygame.Surface((100,200)) # I'm going to use 100x200 in examples
data = pygame.image.tostring(surf, 'RGBA')

and just send the data. But we want to compress it before we send it. So I tried this

from StringIO import StringIO
data = StringIO()
pygame.image.save(surf, x)
print x.getvalue()

Seems like the data was written, but I have no idea how to tell pygame what format to use when saving to a StringIO. So we use the roundabout way.

from StringIO import StringIO
from PIL import Image
data = pygame.image.tostring(surf, 'RGBA')
img = Image.fromstring('RGBA', (100,200), data)
zdata = StringIO()
img.save(zdata, 'JPEG')
print zdata.getvalue()
jhfelectric 2013-10-05 10:23:37

thx, I think I forgot to mention that the other side of the pipe is a .NET app expecting bytes. The tostring works very well of course if the recipient is in Python.

kalhartt 2013-10-05 13:33:31

@jhfelectric Both of these are strings of the raw bytes, equivalent to what you get from open(name, "rb")

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